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Method using photographic density value to measure homogeneous material thickness

A technology of material thickness and blackness, applied in measuring devices, using wave/particle radiation, instruments, etc., can solve the problems of high price and large amount of invested capital, saving purchase costs, strong applicability, and improving detection quality. Effect

Inactive Publication Date: 2013-12-25
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In short, no matter whether it is a thickness measurement on sale or a public patent, if it is to be implemented, capital investment is required, and the amount of capital invested is relatively large. This can be clearly analyzed from the composition of its instrument device, and the X-ray generating device is a must. The current price of an imported general-shaped X-ray machine is between 300,000 and 1 million yuan, and the price of a special X-ray machine will be even higher.
In addition, X-ray receiving devices, signal conversion devices, application software and computer-aided devices also require a lot of money.

Method used

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  • Method using photographic density value to measure homogeneous material thickness
  • Method using photographic density value to measure homogeneous material thickness
  • Method using photographic density value to measure homogeneous material thickness

Examples

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Embodiment

[0044] Take a large aluminum alloy precision casting in the shape of a truncated cone as an example, hereinafter referred to as aluminum castings such as Figure 4 shown;

[0045] In the first step, the thickness of the aluminum casting is estimated to be 12-17mm;

[0046] The second step is to select a standard ladder test block made of aluminum, such as figure 1 As shown, there are 10 steps, and their heights from high to low are 30mm, 27mm, 23mm, 21mm, 18mm, 16mm, 14mm, 12mm, 10mm, 8mm;

[0047] The third step is to select the X-ray radiographic parameters for the aluminum material standard ladder test block as follows:

[0048] Transillumination tube voltage 70Kev, tube current 20mA, exposure time 1Min, focal length 1000mm; film system: film AgFa D7, developer and fixer are "Tianhai set medicine", developing time 3Min, fixing time 5Min, developing temperature 28℃;

[0049] The fourth step is to arrange the radiographic film, and use the parameters of the third step to p...

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Abstract

The invention relates to an X-ray nondestructive inspection method, belongs to the technical field of nondestructive inspection and particularly relates to a method using a photographic density value to measure the homogeneous material thickness. The method comprises the first step of previously estimating the thickness of the detected homogeneous material and choosing a standard step test block, the second step of carrying out radiography on the chosen standard step test block and using a nigrometer to measure the density value corresponding to the standard step test block, the third step carrying out fitting between the radiography density value measured by the nigrometer in the second step and the chosen density value of the standard step test block in the first step to obtain a fitting formula and the fourth step of using the method in the second step take pictures for the homogeneous material to be tested, measuring the radiography density value and substituting the density value into the fitting formula obtained in the third step to calculate the density value of the homogeneous material to be tested.

Description

technical field [0001] The invention relates to an X-ray non-destructive testing method, in particular to a method for measuring and calculating the thickness of a homogeneous material by using the blackness value of a film, and belongs to the technical field of non-destructive testing. Background technique [0002] Radiographic inspection of material workpieces using industrial X-ray machines is a general non-destructive testing method. X-rays are attenuated after passing through the object, and the attenuated rays make the radiographic film sensitive, and the film is developed and fixed to become a black and white negative film. When X-rays pass through objects with uneven thickness or defects such as pores, cracks, inclusions, etc., the attenuation of the rays changes. The attenuation is greater when passing through thick or denser materials than the bulk, and through thin or denser than the bulk. Substances with low density have less attenuation, so different shades of ...

Claims

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Application Information

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IPC IPC(8): G01B15/02
Inventor 蔡闰生任华友马兆庆袁生平
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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